For long time I have been using hibernation instead of shutdown. I do normal shutdowns maybe twice a week if not less. After hibernation I always power off computer (from UPS button) because USB devices stays working.
I don't know what happened but now my PC isn't shutting down after falling to hibernation. It justs restarts. But restarts with delay of 1/2 seconds (not sure). I don't know what's wrong. Problem from hardware level or OS problem? Maybe it's because of overclocking that I failed (computer just froze up and I was forced to reset CMOS)? Also no problems were indicated by Memtest86+.
Windows XP PRO SP3 with latest updates of course Motherboard - Gigabyte GA-945PL-S3 CPU - DualCore Intel Core 2 Duo E4300, 1800 MHz (9 x 200) Video card - Gigabyte GeForce 7200 GS
I noticed that computer does turn off, but not the motherboard. I can hear that HDD shudowns off.